17:15 〜 19:15
[ACG52-P03] Patricle tracking for transport and modification of the Atlantic Water around the Fram Strait and Barents Sea
キーワード：北極海、大西洋水、海洋大循環モデル、粒子追跡
The seawater temperature in the Arctic Ocean has been recently increased, known as the Atlantification. It leads to the retreat of sea ice and alters the climate system in the Arctic region. Atlantic water flows into the Arctic Ocean through the Barents Sea and the Fram Strait, filling the halocline layer and its underlying layer, respectively. Given that the inflow of Atlantic water through these pathways influences oceanic stratification and sea ice in the Arctic Ocean, understanding their volumes and the mechanisms behind these changes is crucial. This study tackles this this issue by quantitatively analyzing Atlantic water inflows using high-resolution ocean models and particle tracking.
The model used in this study is the ice-ocean general circulation model, COCO. The horizontal grid size varies spatially, with the poles of the general curvilinear horizontal coordinates placed near the Fram Strait and the Barents Sea. In the Fram Strait and the Barents Sea Opening, the horizontal grid sizes range from 2 to 3 kilometers. The model is run from 2000 to 2020 using the 3-hourly sea surface condition dataset (JRA55-do). The inflow of Atlantic Water is well reproduced in our model.
The simulated ocean currents are utilized for particle tracking. Particles are generated in the Nordic Sea in proportion to the volume transport of Atlantic water, and their paths are traced. Some particles diverge and flow into the Barents Sea through the Barents Sea opening, while others flow into the Arctic Ocean through the Fram Strait, and the remaining particles return to the Nordic Sea. We aim to quantitatively determine the passage percentages of these particles along each pathway and investigate the mechanisms behind their variations.
The model used in this study is the ice-ocean general circulation model, COCO. The horizontal grid size varies spatially, with the poles of the general curvilinear horizontal coordinates placed near the Fram Strait and the Barents Sea. In the Fram Strait and the Barents Sea Opening, the horizontal grid sizes range from 2 to 3 kilometers. The model is run from 2000 to 2020 using the 3-hourly sea surface condition dataset (JRA55-do). The inflow of Atlantic Water is well reproduced in our model.
The simulated ocean currents are utilized for particle tracking. Particles are generated in the Nordic Sea in proportion to the volume transport of Atlantic water, and their paths are traced. Some particles diverge and flow into the Barents Sea through the Barents Sea opening, while others flow into the Arctic Ocean through the Fram Strait, and the remaining particles return to the Nordic Sea. We aim to quantitatively determine the passage percentages of these particles along each pathway and investigate the mechanisms behind their variations.